netdev - Re: Big performance loss from 3.4.63 to 3.10.13 when routing ipv4

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Date:	Tue, 22 Oct 2013 21:07:41 +0200
From:	Wolfgang Walter <linux@...m.de>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	netdev@...r.kernel.org
Subject: Re: Big performance loss from 3.4.63 to 3.10.13 when routing ipv4

Am Mittwoch, 2. Oktober 2013, 00:20:02 schrieb Hannes Frederic Sowa:
> On Tue, Oct 01, 2013 at 06:39:32PM +0200, Wolfgang Walter wrote:
> > All network traffic over the router become slow and sluggish. If one pings
> > the router there is a packet loss. After about 2 minutes the traffic
> > completely stalls for about 1 minute. Then it works again as in the
> > beginning to then stall again. And so on.
> 
> Maybe dropwatch can give a first hint?
> 

I finally found the problem:

In 3.10.x and 3.11.x the value of /proc/sys/net/ipv4/xfrm4_gc_thresh is 1024.

It is much higher in 3.4.x. If I increase this value in 3.10.x to the one I 
see on 3.4.x all works fine with 3.10.x

Regards,
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
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